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Export Sales and Major Customers (Details Textual) (Net Sales [Member])
 12 Months Ended
Feb. 28, 2015
Customers
Feb. 28, 2014
Customers
Percentage sales to major customer    
Sales from major customers 63.00%us-gaap_ConcentrationRiskPercentage1 62.00%us-gaap_ConcentrationRiskPercentage1
Number of major customers 2sodi_NumberOfMajorCustomer 2sodi_NumberOfMajorCustomer
Raytheon Company [Member]    
Percentage sales to major customer    
Sales from major customers 48.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= sodi_NetSalesMember
/ us-gaap_MajorCustomersAxis
= sodi_RaytheonCompanyMember		 56.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= sodi_NetSalesMember
/ us-gaap_MajorCustomersAxis
= sodi_RaytheonCompanyMember
United States Government [Member]    
Percentage sales to major customer    
Sales from major customers 15.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= sodi_NetSalesMember
/ us-gaap_MajorCustomersAxis
= sodi_UnitedStatesGovernmentMember		 6.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= sodi_NetSalesMember
/ us-gaap_MajorCustomersAxis
= sodi_UnitedStatesGovernmentMember